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PUMP’S HYDRAULIC DESIGN DEVELOPMENT

Ovidio Montalvo

Corporate development - Hydraulics

Ruhrpumpen Monterrey, Mex.

Feb-2015

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IMPELLER DESIGN CALCULATOR

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Full blade thickness control.

Designs control and storing.

Inventor readable files.

Easy CAD modeling (2 to 5min).

IMPELLER DESIGN CALCULATOR Impeller dimensioning.

Hydraulic calculations.

Friendly user interface.

Meridional section design.

Blade Development design.

Blade angles control and monitoring.

Real-time 2D and 3D geometry visualization.

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DATA INPUT Selection of impeller type:

Radial or semi-axial. Single or double entries.

Best Efficient Point (BEP) desired. Calculation of Specific Speed.

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IMPELLER DIMENSIONING

Impeller diameter dimensioning. Impeller outlet dimensioning.

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BLADES’ CHARACTERISTICS

Blade number recommendation. Blade thickness recommendation according to application.

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INLET DIMENSIONING

Eye diameter dimensioning. Eye are and fluid velocity is calculated.

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MERIDIONAL SECTION DESIGN

Using conventional Arc/straight lines method.

Using Bezier curves method.

Leading Edge positioning.

Streamlines definition.

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INLET VELOCITY TRIANGLES

Blockage, incidence and blade inlet angles are calculated.

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OUTLET VELOCITY TRIANGLES AND THEORETICAL HEAD

Outlet velocity triangles are calculated.

Hydraulic efficiency is calculated based on two different approaches.

Theoretical Head and Head coefficients are calculated using two different hydraulic efficiencies.

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BLADE DEVELOPMENT

Blade development.

Blade angle monitoring.

3D preview and top view.

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BLADE THICKNESS

Thickness development.

Blade angle monitoring.

3D preview.

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SAVE PROJECT

CAD software readable points are generated.

Project screenshots.

Project control.

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VOLUTE DESIGN*

Cutwater diameter.

Volute throat area calculation.

Volute cross section shape (Under development).

*Still under development on Matlab code.

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Section design.

Area development.

Mechanical/Hydraulic trade-off.

VOLUTE DESIGN*

*Still under development on Matlab code.

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DESIGN EXAMPLES

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EXAMPLES

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PERFORMANCE CURVES CALCULATOR

Performance curves scaling

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PERFORMANCE CURVES CALCULATOR

Curves scaling

Impeller trim

Prototypes scaling

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IMPELLER TRIM Find trim

Multy-trim

Specified trim

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PUMP CHANGE IN SPEED/SIZE

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FIND PUMP SCALING FACTOR Used when pumps with same

specific speed are to be scale to comply an specific operation point

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DESIGN RELATED TOPICS

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RESEARCH AND DATA CORRELATION

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SCALE PROTOTYPING TEST CFD prototyping

Real scale prototyping

Small scale prototyping

Data correlation

Data scaling (using curves calculator)

Geometry optimization

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COMPUTATIONAL FLUID DYNAMIC - CFD Flow velocity

Surface pressure

Streamlines

Streaklines

Pathlines

Particles

Cavitation zones

Vortex zones

Head

Efficiency

Power

NPSH

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STEADY STATE ANALYSES

TRANSIENT ANALYSES

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ON-DESIGN OPTIMIZATION

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OFF-DESIGN OPTIMIZATION

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LEAKAGE GAPS Looses detections

Vortices

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NOTES Calculators programmed using Matlab® R2013, R2014a and R2014b.

CFD simulations using Simerics PumpLinx.

Not all the images shown for impellers design are functional impellers but for illustrative purpose.

Credits:

Ing. José de Jesús Galarza: Bezier curves programmer, real-time interactive user interface and speed optimization on Impeller Calculator.

Ruhrpumpen S.A. de C.V.